Structural Elucidation And Electrochemiluminescence On A 3D Cadmium (II) MOF With 5-C Topology

A novel cadmium (II) based MOF, [Cd(μ–ppza)]n (1) (H2ppza = 3–(pyridin–4–yl)–1H–pyrazole–5–carboxylic acid) was synthesized under solvothermal condition. The single-crystal X-ray diffraction reveals that the title MOF 1 exhibits a 3D structure bridged through the carboxylic group, which has a 5-c {46.64} topological structure. Furthermore, MOF 1 exhibits good electrochemiluminescence (ECL) behavior.

Solvothermal Preparation of a Lanthanide Metal-Organic Framework for Highly Sensitive Discrimination of Nitrofurantoin and l-Tyrosine

Metal-organic frameworks (MOFs) have been rapidly developed for their broad applications in many different chemistry and materials fields. In this work, a multi-dentate building block 5-(4-(tetrazol-5-yl)phenyl)-isophthalic acid (H3L) containing tetrazole and carbolxylate moieties was employed for the synthesis of a two-dimensional (2D) lanthanide MOF [La(HL)(DMF)2(NO3)] (DMF = N,N-dimethylformamide) (1) under solvothermal condition. The fluorescent sensing application of 1 was investigated. 1 exhibits high sensitivity recognition for antibiotic nitrofurantoin (Ksv: 3.0 × 103 M−1 and detection limit: 17.0 μM) and amino acid l-tyrosine (Ksv: 1.4 × 104 M−1 and detection limit: 3.6 μM). This work provides a feasible detection platform of 2D MOFs for highly sensitive discrimination of antibiotics and amino acids.

A novel and facile green synthesis method to prepare LDH/MOF nanocomposite for removal of Cd(II) and Pb(II)

To date, many nanoadsorbents have been developed and used to eliminate heavy metal contamination, however, one of the challenges ahead is the preparation of adsorbents from processes in which toxic organic solvents are used in the least possible amount. Herein, we have developed a new carboxylic acid-functionalized layered double hydroxide/metal–organic framework nanocomposite (LDH/MOF NC) using a simple, effective, and green in situ method. UiO-66-(Zr)-(COOH)2 MOF nanocrystals were grown uniformly over the whole surface of COOH-functionalized Ni50Co50-LDH ultrathin nanosheets in a green water system under a normal solvothermal condition at 100 °C. The synthesized LDH/MOF NC was used as a potential adsorbent for removal of toxic Cd(II) and Pb(II) from water and the influence of important factors on the adsorption process was monitored. Various non-linear isotherm and kinetic models were used to find plausible mechanisms involved in the adsorption, and it was found that the Langmuir and pseudo-first-order models show the best agreement with isotherm and kinetic data, respectively. The calculated maximum adsorption capacities of Cd(II) and Pb(II) by the LDH/MOF NC were found to be 415.3 and 301.4 mg g−1, respectively, based on the Langmuir model (pH = 5.0, adsorbent dose = 0.02 g, solution volume = 20 mL, contact time = 120 min, temperature = 25 ℃, shaking speed 200 rpm).

Solvothermal and mechanochemical intercalation of Cu into La2O2S2 enabled by the redox reactivity of (S2)2- pairs

Intercalation of Cu into layered polychalcogenide La2O2S2 was demonstrated to be viable both in solvothermal condition at 200 °C and mechanical ball milling at ambient temperature. This result evidences the...

Ln-MOFs with window-shaped channels based on triazine tricarboxylic acid as a linker for the highly efficient capture of cationic dyes and iodine

Seven isostructural complexes were synthesized under solvothermal condition by the 4,4′,4′′ ((1,3,5-triazine-2,4,6-triyl)tri(azanediyl))tribenzoic acid and rare earth metal ions. It is found that 1 exhibits the adsorption capacity of 758.72 mg g−1 to iodine.

A luminescent metal-organic framework with tetragonal nanochannel as efficient chemosensor for nitroaromatic explosives detection

A novel 3D MOF [(Zn4O)(H2O)2(TPA)2]·8DMA (1) (H3TPA = 4,4′,4″-nitrilotrisbenzoic acid; DMA = N, N-dimethylacetamide) with tetragonal nanochannel has been rationally obtained under solvothermal condition using the fluorescent ligand H3TPA. MOF...

Electrochemiluminescence properties, or luminescence sensing of four novel polymers derived from 3-(pyrazin-2-yl)-1H-Pyrazole-5-carboxylic acid

On the basis of 3-(pyrazin-2-yl)-1H-Pyrazole-5-carboxylic acid (H2L) ligand, four new polymers [Cu2(L2–)2] (1), [Zn3(L2–)2(H2O)4Cl2]n (2), [Pb(HL–)Cl]n (3), {[Ni(L2−)(H2O)]•(H2O)}n (4) have been synthesized under solvothermal condition. Polymer 1 possesses a discrete...

An Exceptionally Stable Luminescent Cadmium(II) Metal-Organic Framework as Dual-functional Chemoensor for Detecting Cr(VI) Anions and Nitro-containing Antibiotics in Aqueous Media

Based on four kinds of binuclear cadmium-carboxyl SBUs and two independent cadmium cations, a robust metal organic framework, with the formula being {[Cd10(DDB)4(bpz)8(DMA)(H2O)8.2]•2H2O}n (1), was successfully fabricated under solvothermal condition....

Controllable synthesis of 3D Urchin-like V2O5 as high-stability for Lithium-ion battery cathodes

A facile technique was used to prepare self-assembled 3D urchin-like V2O5 under solvothermal condition. The 3D urchin-like V2O5 could provide high Li[Formula: see text] capacity with excellent rate performance, presenting a high reversible discharge capacity of 271.6[Formula: see text]mAh[Formula: see text]g[Formula: see text], at 0.1[Formula: see text]C. At current density of 1[Formula: see text]C, it shows a high reversible capacities of 209[Formula: see text]mAh[Formula: see text]g[Formula: see text] with capactity retention of 91.8% (191[Formula: see text]mAh[Formula: see text]g[Formula: see text]) after 380 cycles. Even at 2[Formula: see text]C and 5[Formula: see text]C, the capacity displays 172.4 and 129.24[Formula: see text]mAh[Formula: see text]g[Formula: see text]. The above enhanced performance is caused from greatly enhanced charge transportation, which closely relates to the structural stability and more channels for Li[Formula: see text] transfer of the unique 3D urchin-like V2O5.